I say go for it, it's just a cake and the figurines will come off when they cut it up anyway. It sounds like your family/friends get your personalities and will think it is fitting, plus you two like it and that's what it's all about

I think the way you worded your post, you've already answered the question! Do it, you said it's so you.

Ok, so I went back and read comments after I voted and wrote this, and noticed the plane. Totally didn't see it at first, thought it was just the wreckage along the cake at the top. I agree that switching it out for a jeep is a better idea then the plane.